Regular expression for URL validation (in JavaScript)

This REGEX is a patch from @Aamir answer that worked for me

/((?:(?:http?|ftp)[s]*:\/\/)?[a-z0-9-%\/\&=?\.]+\.[a-z]{2,4}\/?([^\s<>\#%"\,\{\}\\|\\\^\[\]`]+)?)/gi

It matches these URL formats

1. yourwebsite.com
2. yourwebsite.com/4564564/546564/546564?=adsfasd
3. www.yourwebsite.com
4. http://yourwebsite.com
5. https://yourwebsite.com
6. ftp://www.yourwebsite.com
7. ftp://yourwebsite.com
8. http://yourwebsite.com/4564564/546564/546564?=adsfasd

You can simple use type="url" in your input and the check it with checkValidity() in js

E.g:

your.html

<input id="foo" type="url">

your.js

$("#foo").on("keyup", function() {
    if (this.checkValidity()) {
        // The url is valid
    } else {
        // The url is invalid
    }
});

Try this it works for me:

 /^(http[s]?:\/\/){0,1}(w{3,3}\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/;

I couldn't find one that worked well for my needs. Written and post @ https://gist.github.com/geoffreyrobichaux/0a7774b424703b6c0fffad309ab0ad0a

function validURL(s) {
    var regexp = /^(ftp|http|https|chrome|:\/\/|\.|@){2,}(localhost|\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|\S*:\w*@)*([a-zA-Z]|(\d{1,3}|\.){7}){1,}(\w|\.{2,}|\.[a-zA-Z]{2,3}|\/|\?|&|:\d|@|=|\/|\(.*\)|#|-|%)*$/gum
    return regexp.test(s);
}